What does code U0053 mean?

Q: What does code U0053 mean?

Vehicle Communication Bus C (-) High. U0053 is a generic network communication code indicating that the vehicle's Controller Area Network (CAN) bus C negative circuit is reading a sustained high voltage, which the module interprets as a short to power or a loss of the differential signal. The computer that set this code detected the CAN C minus line sitting at or near battery voltage instead of the expected fluctuating low signal during normal bus communication.

DTC codes / U00xx · Network wiring and bus faults / U0053

U0053Vehicle Communication Bus C (-) High

U0053 is a generic network communication code indicating that the vehicle's Controller Area Network (CAN) bus C negative circuit is reading a sustained high voltage, which the module interprets as a short to power or a loss of the differential signal. The computer that set this code detected the CAN C minus line sitting at or near battery voltage instead of the expected fluctuating low signal during normal bus communication.

SystemNetwork

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaNetwork wiring and bus faults

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.